Device and Method to Fix a Message on a Display

ABSTRACT

Briefly, an intelligent label is disclosed that has two viewable surfaces. Each surface is constructed such that a permanent and irreversible message may be set into each surface independently. That is, a first message may be set into the first viewing surface of the electro-optic material, and another message may be set into the second viewing surface, for example, at a later time. Various constructions are described including a construction using two pairs of stimulating electrodes, and a second construction using a single pair of stimulating electrodes.

RELATED APPLICATIONS

This application claims priority to U.S. application Ser. Nos.14/569,760 and 14/551,600, each titled “Intelligent label ProcessingSystem,” filed Dec. 14, 2014 and Nov. 24, 2014 respectively, as well asto U.S. patent application Ser. No. 14/479,055, entitled “An IntelligentLabel Device and Method,” filed Sep. 5, 2014; each of which isincorporated herein as if set forth in their entirety. This applicationalso claims priority to provisional application Ser. No. 61/922,060,filed Dec. 30, 2013; provisional application Ser. No. 61/955,235, filedMar. 19, 2014; provisional application Ser. No. 61/955,236, filed Mar.19, 2014; provisional application Ser. No. 61/955,237, Mar. 19, 2014;provisional application Ser. No. 61/975,112, filed Apr. 4, 2014;provisional application Ser. No. 62/025,043, filed Jul. 16, 2014; andprovisional application Ser. No. 62/025,045, filed Jul. 16, 2014; eachof which is incorporated herein as if set forth in their entirety.

FIELD OF THE INVENTION

The present inventions relates to electro-optic devices for setting afirst permanent and irreversible message on one surface of anintelligent label, and then at a second time, setting a second permanentand irreversible message on another surface of the intelligent label.

BACKGROUND

Modern commerce is increasingly dependent on transporting goods usingcarriers as society embraces more and more online shopping. For example,modern consumers are increasingly using online shopping and commoncarriers for delivering wine, prescription medication, food, andsensitive electronic devices. To assist in tracking and monitoring themovement of sensitive and expensive goods, labels have been developed inthe past that incorporate RFID communication and intelligence. In thisway, at the point of shipment and throughout the major carriers, thegood has the ability to be tracked. However, adoption of such RFIDlabels has been slow, as the equipment for initializing, loading,updating, and interrogating the label's RFID electronics is expensive,and typically only available at larger transfer points in the shippingtransaction. Further, it is unlikely, and even rare, for the endconsumer to be able to interact with the label. Since the consumer is acritical part of the delivery chain, and the consumer is excluded fromparticipation in the information available on the label, the use ofintelligent labels has been quite low and very ineffective in improvingthe customer experience.

In U.S. patent application Ser. No. 14/479,055, entitled “An IntelligentLabel Device and Method,” which is incorporated herein, a newintelligent label is described. An intelligent label is associated witha good, and includes one or more permanent and irreversibleelectro-optic devices that are used to report the condition of that goodat selected points in the movement or usage of that good. Theseelectro-optic devices provide immediate visual information regarding thegood without need to interrogate or communicate with the electronics orprocessor on the intelligent label. In this way, anyone in the shippingor use chain for the good, including the end user consumer, can quicklyunderstand whether the product is meeting shipping and qualitystandards. If a product fails to meet shipping or quality standards, theparticular point where the product failed can be quickly and easilyidentified, and information can be used to assure the consumer remainssafe, while providing essential information for improving the shippingprocess. It will be understood that the intelligent label may take manyforms, such as a tag attached to the good, integrated into the packagingfor the good, integrated into the good itself, or may even be aninformation area on a prepaid card for example. The intelligent labelmay also include, for example, print information regarding the good,usage or shipping rules, or address and coded information.

In a particular construction, the intelligent label includes a computerprocessor for managing the overall electronic and communicationprocesses on the intelligent label. For example, the processor controlsany RFID communication, as well as storage of information data. Theprocessor also has a clock, which may be used to accurately identifywhen the good changed hands in the shipping chain, or when the goodfailed to meet a quality standard. In this regard, the intelligent labelmay also have one or more sensors that can detect a chemical or gaseouscomposition, optical, electrical or an environmental condition such astemperature, humidity, altitude, or vibration. If the processordetermines that the sensor has a condition that exceeds the safehandling characteristics, then the processor may store informationregarding the out-of-specification handling, and may take additionalactions as necessary. For example, if the out-of-specification handlingis minimal, the processor may cause an electro-optic device such as anelectrochromic indicator or display to show a “caution” as to using theproduct. In another example, the processor may determine that the sensorhas greatly exceeded the outer specification criteria, and cause anelectro-optic indicator to show that the product is spoiled or otherwiseunusable. Note that the term ‘display’ as used herein is to beunderstood to encompass indicators and other electro-optic devicescapable of displaying visually perceptible states, data, information,patterns, images, shapes, symbols etc. which are collectively referredto herein as “messages”.

The intelligent label may also be constructed with an actuator that canrobustly determine the time when the label was attached to the good. Forexample, the removal of the adhesive backing from a label may make orbreak an electronic circuit that causes the processor to identify thetime when the label adhesive was removed or when the label was attachedfor shipping. In another example, the actuator can determine when ashipping package was sealed for shipping. Since this action necessarilyhappens within moments of the label being attached to the good, there isan accurate and traceable time as to when the good was placed by theshipper into the shipping chain. Thereafter, RFID communications may beused to retrieve and load additional information with the label, inorder to track the good through the shipping chain.

Advantageously, the intelligent label provides a robust, trustworthy,easily usable system for tracking goods from a point of origin todelivery to the consumer. Importantly, the intelligent label providesimportant visual alerts, updates and information throughout the shippingprocess without the need for expensive communication, RFID, orinterrogation equipment. Further, the intelligent label facilitatessimple and reliable communication of shipping information from aconsumer back to a manufacturer or seller, for example, for confirmingwarranty or replacement information. In this way, a shipping anddelivery system having a high degree of trust, and resistance to fraud,is enabled.

In U.S. patent application Ser. Nos. 14/551,600 and 14/569,760, bothentitled “Intelligent Label Processing System,” which are incorporatedherein, a network system is described for advantageously using the newintelligent label. The new network processing system collects andcoordinates key indicators regarding a good's condition or quality asthat good moves from a supplier to an end user. It will be understoodthat the supplier may be the manufacturer of the product, or it may be aretailer or distributor or the product. It will also be understood thatthe terms “good” and “product” may be used interchangeably herein. Bycollecting more complete information regarding the good and its deliverypath, the processing system provides robust, authentic, and trustworthydata that (1) reports the time and/or the time period when thirdparties, e.g. distributors, resellers and shippers, had custody of thegood, (2) identifies what timing or environmental condition causedchanges in the condition of the good, and (3) verifies which party hadpossession of the good when the changes occurred. In use, an intelligentlabel is attached to a good, and the intelligent label has a timer orreal-time clock and/or one or more sensors for monitoring environmentalconditions. Upon exceeding timing or environmental rules, a visualindicator is activated on the label. The intelligent label further haselectronically retrievable data, scanable or machine readable data, andhuman readable data, which enables the network process to collect keydata regarding the good along the entire distribution chain.

In operation, an intelligent label is associated with a good, andincludes one or more preferably permanent and irreversible electro-opticdisplays that are used to report the condition of that good at selectedpoints in the movement or usage of that good. These electro-opticdisplays provide immediate visual information regarding the status ofthe good without need to interrogate or communicate with the electronicsor processor on the intelligent label. In this way, anyone in theshipping or use chain for the good, including the end user consumer, canquickly understand the condition of the goods (e.g. ascertain whetherthe good is meeting shipping and quality standards, and to what extent).If the condition of the good warrants an action (e.g. the condition hasdegraded and fails to meet shipping or quality standards) the particulartime and custodian of the good, when the condition of the good changedto the extent that action is warranted can be quickly and easilyidentified, and information can be used to enable the appropriate actionto be taken (e.g. the goods are not used or consumed, the goods areproperly dispose or replaced, a return authorization or credit is issuedetc.). In many cases the appropriate action requires that thisinformation is made available to one or more parties and its veracityappropriately verifiable to enable its use to drive business rules andrespond to the change(s) in conditions as appropriate to thecircumstances (e.g. the good, the change in conditions, the buyer,seller etc.).

In some cases, however, it is desirable that a display be viewable fromboth a front side and a back side. In this way, information can bedisplayed to different viewers, and this information can be the same ordifferent. Further, it may be desirable to update or modify theinformation on the permanent display, which is particularly challengingas the message is intentionally constructed to be permanent andunchangeable.

A particularly difficult problem occurs when a permanent andirreversible message has been set on the intelligent label, and thensomething occurs, either external or internal to the good or label, thatmakes the message no longer correct. For example, a prescription drugwith an intelligent label may have been sent to consumer with theintelligent label having a permanent and irreversible message set thatindicates a particular expiration date. However, after the good has beenshipped it is discovered that the experimental drug deteriorates muchfaster than expected, and the expiration date is wrong. Because thelabel's message is permanent and irreversible, the provider has noalternative but to recall the drug and re-package or re-label it, whichis expensive and may cause harm to the patient due to delayed receipt ofgood medicine, or if the patient should wrongly take the expiredmedication. Accordingly, there exists a need to obliterate or change orsupplement a message that is incorrect or misleading.

SUMMARY OF THE INVENTION

An intelligent label is provided that has an electro-optic display thatconsists in part of an irreversible electro-optic layer that has twoviewable message surfaces. Each message surface of the electro-opticlayer is constructed such that a permanent and irreversible message maybe set into each message surface independently. That is, a first messagemay be set into the first message surface of the electro-optic layer,and another message may be set into the second message surface, forexample, at a later time. Various constructions are described includinga construction using two pairs of activating electrodes, and a secondconstruction using a single pair of activating electrodes.

An intelligent label is described that has a message that can bepermanently and irreversibly set on one message surface of theelectro-optic layer. Advantageously, the intelligent label provides asecond message surface on the opposite side of the electro-optic layerthat can be used in a variety of ways depending on the particularconstruction selected. In a first use, an opaque electro-optic layerseparates the first and second message surfaces. In this way, a separateand distinct message can be placed on either surface, and theintelligent label is usefully viewed from both sides. In some cases itmay be useful to have the same message projected on both messagesurfaces, and in other cases the message surfaces may have differentmessages set. In a second use, the second message on the second messagesurface of the electro-optic layer acts to adjust, supplement, or changethe message that is set on the first message surface. In this case, theintelligent label is viewed from one direction, and a first message isset into the first message surface. Later, additional characters,symbols, lines, or colors can be set into the second message surfacesuch that a viewer or reader sees the combined effect of the twomessages.

In another example, an intelligent label is used that has a message thatcan be permanently and irreversibly set on one message surface. If atsome later time that message becomes incorrect, false, or misleading,then the intelligent label is constructed to permit that message to beobliterated in a way that renders the information in the messageunusable, nonsensical, null or unreadable. In one example construction,the intelligent label has an electro-optic display comprising in part anelectro-optic material layer that is arranged for dual surfaceactivation. That is, a first activation sets a first message on a firstmessage surface of the electro-optic layer, for example an expirationdate, and at a later time, a second activation sets a second message ona second message surface of the electro-optic layer, for example anopaque shape that can partially or fully visually impair or obscure thefirst message, the expiration date. This obscuring message can take anyof several forms, such as a crosshatch pattern or solid shape. Inanother example construction, the intelligent label has an electro-opticlayer that is arranged for single surface activation. In thisconstruction, a first activation sets selected segments to form amessage, and at a later time in a second activation, other segments areset to make the message nonsensical or unreadable.

In operation, an intelligent label is associated with a good, andincludes one or more, preferably permanent and irreversibleelectro-optic displays that are used to report the condition of thatgood at selected points in the movement or usage of that good. Theseelectro-optic displays provide immediate visual information regardingthe status of the good without need to interrogate or communicate withthe electronics or processor on the intelligent label. In this way,anyone in the shipping or use chain for the good, including the end userconsumer, can quickly understand the condition of the goods (e.g.ascertain whether the good is meeting shipping and quality standards,and to what extent). If the condition of the good warrants an action(e.g. the condition has degraded and fails to meet shipping or qualitystandards) the particular time and custodian of the good, when thecondition of the good changed to the extent that action is warranted canbe quickly and easily identified, and information can be used to enablethe appropriate action to be taken (e.g. the goods are not used orconsumed, the goods are properly dispose or replaced, a returnauthorization or credit is issued etc.). In many cases the appropriateaction requires that this information is made available to one or moreparties and its veracity appropriately verifiable to enable its use todrive business rules and respond to the change(s) in conditions asappropriate to the circumstances (e.g. the good, the change inconditions, the buyer, seller etc.).

If at a later time the message set by the intelligent label is found tobe incorrect or incomplete, then that message as viewed or read can bechanged. The intelligent label has sufficient intelligence and power toperform the second change activation, which may be responsive to acommunication received wirelessly by the intelligent label, or may bedue to some internal stimulus such as elapsed time or a sensedenvironmental condition.

BRIEF DESCRIPTION OF DRAWINGS

These and other objects and advantages of the invention will becomeapparent upon reading the following detailed description and uponreferring to the drawings in which:

FIG. 1 is a block diagram of a side view of a display device inaccordance with the present invention.

FIG. 2 is a block diagram of a seven-segment display layer in accordancewith the present invention.

FIG. 3 is a block diagram of an obscuring pattern in accordance with thepresent invention.

FIG. 4 is a block diagram of a side view of a display device inaccordance with the present invention.

FIG. 5 is a block diagram of a side view of a display device inaccordance with the present invention.

FIG. 6 is a block diagram an obscuring pattern in accordance with thepresent invention.

FIG. 7 is a block diagram of a side view of a display device inaccordance with the present invention.

FIG. 8 is a block diagram of a side view of a display device inaccordance with the present invention.

FIG. 9 is an illustration of an informational message using aseven-segment display.

FIG. 10 is an example of modifying the information message of FIG. 10 tobe nonsensical.

FIG. 11 is a block diagram of a side view of a display device inaccordance with the present invention.

FIG. 12 is a block diagram of a side view of a display device inaccordance with the present invention.

FIG. 13 shows example messages.

FIG. 14 is a flow diagram of a process to set and later obscure orchange an information message on a display device in accordance with thepresent invention.

FIG. 15 is a block diagram of a side view of a display device inaccordance with the present invention.

FIG. 16 is a block diagram of a side view of a display device inaccordance with the present invention.

FIG. 17 is a block diagram of a side view of a display device inaccordance with the present invention.

While the invention will be described in conjunction with exampleembodiments, it will be understood that it is not intended to limit theinvention to such embodiments. On the contrary, it is intended to coverall alternatives, modifications and equivalents as may be includedwithin the spirit and scope of the invention. It will be understood thatthe drawings are not to scale, and are simplified to focus thedescriptions and discussions on the inventive processes and structuresdisclosed herein.

DETAILED DESCRIPTION

The following description of exemplary embodiments of the invention isnot intended to limit the scope of the invention to these exemplaryembodiments, but rather to enable any person skilled in the art to makeand use the invention.

An intelligent label is associated with a good, and includes one or morepermanent and irreversible electro-optic displays with an electrochromicelectro-optic layer such as that described in U.S. Pat. No. 9,030,724,titled “Flexible and Printable Electrooptic Devices,” that are used toreport the condition of that good at selected times and points in themovement or usage of that good. U.S. Pat. No. 9,030,724 is incorporatedby reference as if fully set forth herein. These electro-optic displaysprovide immediate visual information, messages, regarding the status orcondition of the good without need to interrogate or communicate withthe electronics or processor on the intelligent label. In this way,anyone in the shipping or use chain for the good, including the end userconsumer, can quickly ascertain the condition or state of the good andrelated time and environmental data that enables the appropriate partiesto act or effect on one or more transactions accordingly.

For the messages perceived from the electro-optic display to be of valuein improving the distribution of goods or in responding to a customercomplaint, the messages must be available and verifiable by the partieswho are then enabled to take action. For example, a pharmaceuticalpackage shipped from a manufacturer directly to a consumer may be out ofspecification when it is delivered if the package has been exposed to atemperature higher than a certain threshold during transit. If this werethe case, the simplest action for the consumer and for the suppliermight be to immediately distribute a new pharmaceutical package to theconsumer and for the consumer to dispose of the original package (andpharmaceuticals). However, there are risks in this situation. A consumermay indicate to the pharmaceutical supplier that this condition existedwhen it did not, and further that they disposed of the original packageand pharmaceuticals when they did not. As a result the consumer wouldreceive two products for the price of one, and importantly the consumermay be tempted to consume dangerous levels of the pharmaceutical ordistribute it illicitly without anyone being the wiser.

To avoid these risks the pharmaceutical supplier needs to be able toverify that the original pharmaceuticals are indeed out of specificationand also that they are disposed of properly. In addition, thepharmaceutical supplier would like to be able to verifiably determinewhen the out-of-temperature event occurred and which party had custodyof the goods when it happened and for how long, as there may have beenmultiple potential parties involved in the distribution chain and thefinancial and remedial responsibility for this out-of-specificationcondition may belong to only one of the parties (including theconsumer). This, and other electronically and optically accessible datafrom the label, also facilitates efficient and effective procedures forreturning the out of specification pharmaceuticals (e.g. via returnshipment or to a nearby bricks-and-mortar location) and effecting theappropriate settlement between the involved parties. The IntelligentLabel Processing System establishes a robust mechanism for datacollection and verification by interested parties in the process.

The current custodian of the good is able to use the intelligent labelto direct processes, which may in some cases be the consumer, and inothers may be a shipper or other third party. For example, anintelligent label that has a simple message, for example, a red ‘dot’,can direct a party that the associated good take an exceptional processpath while all others are processed normally. The local custodian cancommunicate the status of the good and the existence of exception eventsby a variety of means. In one instantiation, the custodian takes a photoof the intelligent label including the message, the red dot, with amobile phone camera and transmits it to other parities in the supplychain.

All parties in the supply chain, both local and remote, can use thesemessages to validate events and to build business rules based around theevents' occurrence. In this regard, it is important that theelectro-optic display is preferably permanent and irreversible in orderthat all parties in the supply chain are able to authenticate the event.Having a permanent or near permanent and irreversible electro-opticdisplay is desirable as it reduces or avoids accidental and intentionalmodification of messages and enables them to be verified after theevent. These messages can also be coupled with other private data thatare electronically accessible to a party in possession of theintelligent label through, for example, RFID protocols. In addition,these messages can be coupled with other public information printed onthe label or the good, such as a serial number, customer identificationnumber, sales order number or ship time/date. Any of these messages andassociated information can be made available to other parties in thesupply chain prior to or during the distribution process. And they cansupport further levels of authentication and provide additionalcontextual information about the event. Secure and robust processes canbe built that depend on the coupling of these messages and otherinformation on the label (including some unknown and inaccessible by thelocal custodian) and traditional supply chain transaction information.

The establishment of a verifiable chronology for a good is key in thedevelopment of these processes. The intelligent label can be used toestablish a timeframe for events and changes of custody of interestsurrounding a good. Events that are tracked by the intelligent labelbeyond this point can be made with respect to that point in time. Insome cases this time can be synchronized with absolute time, but in manycases this synchronization is not required.

Two Surface Activation and Message Generally

Described here is a construction for an electro-optic display that canbe permanently and irreversible set in a first activation to show afirst message, and later, if the underlying information is determined tobe incorrect or incomplete, the message can be changed, supplemented orobliterated. One example construction uses two opposite sides of atransparent electro-optic layer for the activations. That is, the firstmessage is first set into a first message surface of the electro-opticlayer, and during the second activation, a second message is set intothe second message surface of the electro-optical layer so that theperception of the first message is altered or obscured. Doing so enablestrusted and verified parties to control the message at any point duringits life, and provide up to date, accurate information. In oneparticular example, the intelligent label is constructed to allow formultiple activations and thus multiple messages. In this way, a firstactivation can set a first message, and later if that message proves tobe false, misleading, or incorrect, then one or more additionalactivations may be set that obscure or change the first message.

As described above, the preferred embodiment of the intelligent labelincludes a novel permanent and irreversible electrochromic material thatcan be deposited or printed on or along-side each electrodes used toactivate and thereby set messages on the message services of theelectro-optic display and that consist for example of the segments of a7-segment display. And further, that use technology applicable to manyapplications utilizing thin-film and flex-circuit designs. Whenenergized the preferred electrochromic material undergoes a permanentirreversible change in color and can thus be used for messages that canchange dependent on a prescribed set of conditions being met. In use acontrol circuit energizes or activates elements of the display asrequired by the application so that the display shows appropriatemessages. The form of the message can be simple such as an icon orsymbol; or it may be complex such as one or more numeric or alphacharacters. Sometimes, the messages might be inaccurate due to changesin circumstances, information, or standards to which product viabilityis measured. In these instances, it would be of great importance tochange the messages to alarm, update or inform the consumer, wholesaler,or possessor of the good that the good is no longer suitable for use orconsumption. Therefore, it is desirable to create an irreversible labelwith two message surfaces, one to display an initially correct message,and another layer to warn if the messages is no longer correct, or insome cases to update, obscure, or alter the message.

Such an additional separately activated message may be used to informthe user that the information being displayed is incorrect or should notbe relied upon, or to provide updated information. A scenario for use inthe pharmaceutical industry, for example, would be prescriptions or testdrugs that have a specific “use by” date on them. If this date is laterdeemed to be inaccurate, the intelligent label can, using an additionalmessage surface, inform the user that the drugs should not be taken. Twoexample constructions for two-surface activation will be described forillustrative purposes.

In one construction, a two-surface electro-optic display uses a singletransparent electro-optic layer that is sandwiched between two electrodelayers. These three layers are supported on a substrate, and they may beencapsulated with a protective coating. The substrate may be providedparticularly as the base for depositing the electrode and electro-opticlayers for the display device, or alternatively, may be components ofthe intelligent label. The first, or bottom electrode layer, which maybe transparent or opaque, has its surface facing upward toward theelectro-optic layer. The first electrode layer has both positive andground conductors in an interdigitated or patterned arrangement that,using intelligent label electronics, are used to set a permanent andirreversible first message in the bottom message surface of theelectro-optic layer. The second or top electrode layer, which istransparent, is downward facing into the electro-optic layer. The secondelectrode layer also has both positive and ground conductors in aninterdigitated or patterned arrangement that, using intelligent labelelectronics, are used to set a permanent and irreversible second messagein the top message surface of the electro-optic layer that changes,supplements or obliterates the first message. Importantly, the twoelectrode layers are activated independently of each other. It will beunderstood that many variations are possible as to the specificelectrode design and placement, which can be defined according toapplication specific requirements.

In a second construction, a two-surface electro-optic display again usesa single electro-optic layer, but its two associated electrode layerseach only use one electrode. In this construction, the electrode facingthe bottom message surface is in a pattern to provide a first message,and the top electrode, which is transparent, is in a pattern to providea second message that obliterates the first message. When theintelligent label determines to set the first message, the electronicsin the intelligent label apply a comparatively high, positive voltage onthe bottom electrode and then apply a lower, positive voltage on the topelectrode. This allows the first message to be set only into the bottommessage surface of the electro-optic layer, and does not materiallyaffect the top message surface. Later, when the first message is to beobscured or changed, the electronics in the intelligent label apply arelatively high, positive voltage on the top electrode followed by alower, positive voltage on the bottom electrode. This allows the secondmessage to be set into the top surface of the electro-optic material,thereby interfering with or changing the viewable or readable perceptionof the first message.

Two Surface Message Activation Using Two or More Electrode Pairs

Referring now to FIG. 1, a partial side, cross sectional view 100 ofselected active elements for a two-surface 7-segment display are shown.Here, the bottom substrate 106 can be any of a number of differentmaterials, but most commonly will be a flexible plastic or polymer thatcan be used in a number of manners. This substrate 106 may beparticularly provided to function as the support of the display device,or may be a substrate associated with, for example, an intelligentlabel. On the bottom substrate 106 is the first electrode layer 104,which can be a transparent conductor such as ITO or an opaque conductorsuch as a metal, which has been patterned to allow the presentation ofthe 7-segment display. In one construction, each of the 7 segments is aninterdigitated pattern of positive and negative electrodes. Atransparent electro-optic layer 105 is on top of the bottom electrode104. The specific electrochromic material of the electro-optic layer 105is made to be activateable in a way that its color or quality change ispermanent and irreversible. Most often this electro-optic layer 105 willbe transparent or near transparent so that the viewer can discern themessage or character generated by the first electrode layer 104.Accordingly, it is the first electrode layer 104 that is activated bythe intelligent label electronics that causes the bottom message surfaceof the electro-optic layer 105 to have a message permanently andirreversibly set.

A second transparent electrode layer 101, such as ITO, is on top of theelectro-optic layer 105. The second electrode layer 101 has beenpatterned to allow the setting of an obscuring message into the topmessage surface of the electro-optic layer 105. In one construction, theobscuring pattern is an interdigitated pattern of positive and negativeelectrodes, and can be of one or multiple segments. In this way, whenthe second message is set by the second electrode layer the firstmessage set by the first electrode layer is obscured so that itsperceptibility or meaning is substantially altered, reduced or mademeaningless. Accordingly, it is the second electrode layer 101 that isactivated by the intelligent label electronics that causes the topmessage surface of the electro-optic layer 105 to have an obscuringmessage permanently and irreversibly set. The pattern of the secondelectrode layer 101 is described as being an obscuring pattern, but itwill be understood that other patterns maybe used to create othermessages. For example, the second activation may add additional color,symbols, or lines that when viewed in combination with the firstmessage, provide a new updated or corrected combined message.

Referring now to FIG. 2, it is shown that a certain message 200 can beactivated during the first electrode layer 104 activation, whichpermanently and irreversibly sets the message (“2:17:39”) into thebottom message surface of the electro-optic layer, such as electro-opticlayer 105 of FIG. 1. This is accomplished by the programmed labelelectronics sending electrical signals to electrodes in the firstelectrode layer, such as electrode layer 104 of FIG. 1, which in turnenergize of activate the appropriate individual segments (pixels) of theelectro-optic layer. In FIG. 2, each of the symbols 201-205 isconstructed as a separate 7-segment character. Once activated, themessage (“2:17:39”) is set or fixed into the electrochromic material ofthe electro-optic layer and is irreversible and permanent, allowing thecustomer to rely on the message being displayed. The message is thus setinto the bottom message surface of the electro-optic layer 105. If at alater time, it is determined that the information underlying the firstmessage is no longer correct, then the second electrode layer 101 of theintelligent label is activated to change or obscure the first message bysetting a permanent and irreversible pattern message into the topmessage surface of the electro-optic layer 105. The determination ofwhen to active the second, the obliteration, pattern can be maderemotely and wirelessly communicated to the intelligent label using anetwork system and RFID communication, or in some cases thedetermination can be made within the intelligent label itself responsiveto timers or sensors.

FIG. 3 is a representation 300 of one possible obliteration pattern 301that can be activated in the second electrode layer to create a messagethat the previous message, the first message is no longer accurate orreliable. In this particular design, the first message is no longerreadable because the pattern or segments of the second message in thesecond message layer are diagonally overlapping the original, firstmessage. Here, the bottom message surface of the electro-optic layer 105has been activated by a trusted party with correct information at thetime of initial activation. At some point in time between the initialactivation and the time of FIG. 3, a trusted party has deemed the firstmessage inaccurate. When the first message is deemed to be inaccurate, atrusted and verified party may alter the first message by activating thesecond electrode layer 101 to show the second message, the obliterationpattern 301, on the top message surface of the electro-optic layer 105.In this particular design, electrodes are arranged in the secondelectrode layer in a diagonal fashion. Before the first activation, theelectro-optic layer is transparent as are the diagonal electrodes in thesecond electrode layer so that after the first activation, the firstmessage may clearly be read or viewed from the top (as indicated by the“viewing perspective” arrow). After activation of the second electrodelayer 101, the top message surface of the irreversible electro-opticlayer 105 is set and the second message of a diagonal pattern 301informs the consumer (or machine reader) that the product is not safefor use. It should be made clear to users of the intelligent label thata message showing of a diagonal pattern such as this means that theproduct or good is not suitable for use. The second message surface isactivated in a similar fashion to the first message service. The secondelectrode layer 101 may be more simplistic than the 7-segmentarrangement in that it can mean either entirely “on” or “off” “use” or“don't use”. There may be no individual segments to either activatewhile others are not active, or keep inactive when all others areactive. Alternately, the pattern to be activated can be constructed ofmultiple segments to control power usage, or to provide partialobliteration. It will be understood that many alternatives are possiblefor the message pattern of the second layer within the scope of thisdisclosure.

In one other example, the second electrode layer does not obscure thebottom message, but changes its perceptible content. For example, thebottom message surface of the electro-optic layer may be activated firstto display a set of horizontal dashes. At a later time, the top messagesurface of the electro-optic layer may be activated to add a verticalline. When viewed or read from the top, the resulting message is one ormore “+” signs. In a similar way, the bottom message surface can be setto a particular color, and then later the top message surface can be setto another color. When viewed from the top, the perceptible color wouldbe the combination of both the top message surface and bottom messagesurface colors. In one example, the electro-optic layer consists of anelectrochromic material that can be changed to more than one colordepending on the specific signal applied during activation. For example,the electrochromic material may transition to a first color at a veryhigh voltage, but may transition to a different color at a lowervoltage. It will be understood that other signal characteristics such aslength of application and waveform type may also affect the final color.Using the color control capability of the electrochromic material, avoltage may be selected the first activation to set a first color on thefirst message surface. Then, at a later time, the second message surfaceis activated using a different signal voltage, which sets a differentcolor into the second surface. In this way, the final color that isviewed is a combination of the two message colors.

In one specific example, each surface of the electro-optic layer has apair of associated interdigitated electrodes. At a first time, aconditioning signal at a moderate voltage, such as 3 volts, is appliedfor several seconds. Then, the polarity is reversed and a smaller, forexample 1 volt, setting signal is applied. This sets the first surfaceto color, such as red. It will be understood the specific color can beadjusted by the voltages, timings, and material compositions. At a latertime, the second surface can be colored by activating the electrodes ata higher voltage, such as 7 volts, which sets the second surface to adifferent color, such as blue.

FIG. 4 provides a side view of a portion of an intelligent label 400using the two-surface display from FIG. 1, FIG. 2, and FIG. 3. Theintelligent label 400 has a bottom substrate 404 with a first electrodelayer 405 that is arranged to implement a 7-segment electro-opticdisplay. It will be understood that electrical conductors are provided(not shown) that couple the segments to the intelligent label'selectronics and power. Over the first electrode layer 405 is a layer ofelectro-optic material 403. The intelligent label 400 also has a topsubstrate 410 with a second electrode layer 406 that is arranged toimplement an obscuring pattern in the top message surface ofelectro-optic layer 403. During the first activation (FIG. 2), segmentsof the first, or bottom electrode layer 405 are selectively activated topermanently set a message into the bottom message surface of theelectro-optic layer 403 that is human or machine readable. The messageis viewable to the user because the electro-optic layer 403 and the topsubstrate 410 and second or top electrode layer 406 are transparent.When power is applied to the selected segments, the electrochromicmaterial of the electro-optic layer on or adjacent to the segments willbe permanently transitioned to a new color or transparency state.Non-selected segments may have their “select” lines “floating”, that isconnected to an output driver capable of a high-impedance state,commonly known as a tri-state condition. Alternatively, non-selectedsegments may have all segment electrodes and the commoncounter-electrode set to a “high” level, i.e. the “activation voltage”.In this condition no segments will be activated to the colored statesince there is no voltage difference across the electro-optic material.

FIG. 5 further provides the same view as shown in FIG. 4, but isillustrated to also show a message 512 in the top message surface of theelectro-optic layer 403 after the second or top electrode layer 406 isactivated. It should be understood that the first message 401 in thebottom message surface of the electro-optic layer 403, is irreversible,so it does not cease to display the image it has been set to by theintelligent label circuits. The second message 512 is also irreversible,but, when it is set into the top message surface of the electro-opticlayer 403, the first message set into the bottom surface of theelectro-optic layer 403 by first electrode layer 405 is no longerreadable (as in FIG. 3). Since the second electrode layer 406 in thisexample is patterned as a dense crosshatch, as is the pattern of the topsurface of the electro-optic layer once activated, the first, bottommessage is nearly entirely obscured. It will be understood that a moreor less dense pattern may be used according to application needs, aswell as power and time availability. Alternatively, the second messagecan be used to modify or change the perception of the first message, asdescribed earlier.

In an alternate design, it may be essential for the entire first orbottom message to be unreadable by any practical means. In a similarfashion to the two-surface display, this type of device will display afirst message that is critical to the use of the intelligent label.However after a certain point they can no longer be perceived orinterpreted. For instance, pharmaceuticals that are discovered to haveexpired before the date or time displayed represent a very importantchange in information. In this critical use, the intelligent label mustreliably prevent the first message being displayed on the intelligentlabel from being read or interpreted by anyone or anything. To achievethat outcome the second electrode layer (FIG. 6) in this example isconfigured so that upon activation, a fully solid shape 600 that coversor blocks the perceptibility of the first message is set into the topmessage surface of the electro-optic layer. The first message thereforebecomes completely unreadable because it is completely covered by thesecond or top message, a solid shape, and is no longer perceptible bythe human eye, nor by most technology designed to read or scan for codessuch as those that might be messages displayed by the intelligent label.

In another example, the first or bottom electrode layer has electrodesarranged in a pattern, such as for making 7-segment characters. Uponcommand, a first message can be set permanently onto first messagesurface, such as the message 900 “2:17:39” as shown in FIG. 9. Thesecond electrode layer has electrodes arranged in a complementarypattern to, and aligned with, those of the first electrode layer. Inthis way, a second message set on the second message surface can alter,or makes nonsensical, the first message on the first message surfacelayer. By way of example, FIG. 10 shows the display of FIG. 9 where thesecond activation has filled in the 7-segment display to show thenonsensical message 1000 “8:88:88.” It will be understood that manyother message patterns could be used on the second activation.

In another example illustrated in FIG. 11, the electrodes in both thefirst 1102 (bottom) and second 1108 (top) electrodes layers areinterdigitated. That is, each electrode layer 1102 and 1108 has at leastone positive electrode and one ground electrode, configured to form apattern that when activated, set permanently and irreversibly a firstand second message respectively in the bottom message surface and thetop message surface of the electro-optic layer 1104. In this way, thelabel power and control circuits 1106 can effect a first message 1112 tobe set into the bottom message surface of the electro-optic layer 1104.The top electrode layer 1108 has interdigitated electrodes configured ina crosshatch or other obliterating pattern 1113. That is, top electrodelayers 1108 has both a positive electrode and a ground electrode, andwhen activated, permanently and irreversibly set a second message 1113on the second, top message surface of the electro-optic layer 1104. Itwill be understood that as previously described, many other messages canbe created this way.

Dual Message Activation Using One Electrode Pair

In a particular embodiment shown in FIG. 12, a portion of an intelligentlabel 1200 may be constructed in using a simple three-layerelectro-optic display that uses only one electrode pair. Referring stillto FIG. 1s, a layer of electro-optic material 1204 that comprises theelectro-optic layer is sandwiched between a bottom electrode layer 1202and a top electrode layer 1208. The bottom electrode layer 1202 isconstructed to form a pattern in the bottom message surface of theelectro-optic layer with a single electrode. As illustrated in FIG. 13,the bottom pattern 1301, and thus the bottom message, could be a simple,single symbol such as check mark 1301 that shows that an item has beeninspected and is ready for use. The top electrode 1208 is constructed toform a second pattern 1303 into the top message surface of theelectro-optic layer also using a single electrode. The top electrodelayer 1208 in this case being transparent. As illustrated in FIG. 13 thetop pattern 1303, and thus the resultant top message, could also be asimple, single symbol such as an “Q” positioned over the bottom message1301. When activated the compound message 1305 would show that the itemis no longer to be used. Alternatively, the second pattern couldsupplement or obscure the first pattern 1301 as previously discussed.

Compared to certain of the examples discussed earlier, this particularembodiment may be easier to design and manufacture, and may simplify thecontrol circuits. For example, the bottom electrode 1202 may be a singledriveline from the label power and control circuits 1206. Under controlof the control circuit 1206, the bottom electrode 1202 driveline may beeither positive or negative, and may be set at different voltages. In asimilar manner, the top electrode 1208 drive line may be either positiveor negative, and may be set at different voltages. The polarity, timing,and voltage levels are set by the control circuitry 1206 according towhich of the top or bottom surface of the electro-optic material 1204 isto be set.

Referring now to FIGS. 12 and 14, an illustrative method 1400 of usingthe display device of FIG. 12 is shown. It will be understood that theparticular times, polarities, and voltages are selected according to theparticular electro-optic material used, and its particular physicalconstruction (such as thickness).

The intelligent label's control circuit 1206 determines that a firstmessage should be set 1402 responsive to either an external messagereceived from a network or remote system, or internal stimuli such astimers or an environmental sensors. Once the intelligent label controlcircuit 1206 determines to set the first (bottom) message, it uses localpower to apply a first conditioning signal, which is provided as a firstvoltage to the bottom electrode 1208, which is adjacent to the bottommessage surface of the electro-optic layer 1204. This conditioningvoltage may be a relatively high, for example 3 volts, and applied for arelatively long period of time, for example 3 to 4 seconds. It will beappreciated that other voltages and times may be used, and that theconditioning voltage may be applied in bursts, ramps, pulses, or othersuch waveforms or variations. After the first conditioning signal iscompleted, the control circuitry 1206 reverses the polarity, and appliesa first setting signal, which is provided as at a second voltage to thetop electrode 1208, which sets and permanently fixes the bottom messageinto the bottom surface of the electro-optic material 1204. This settingvoltage is typically at a lower voltage than the conditioning voltage,such as 1.2 volts, and is applied for a shorter period of time, such as1-2 seconds. It will be appreciated that other voltages and times may beused, and that the setting voltage may be applied in bursts, ramps,pulses, or other such waveforms or variations. This setting voltage isselected to be low enough and short enough that it sufficiently fixesthe bottom message in the bottom message surface of the electro-opticlayer 1204, but has little if any effect on the top message surface ofelectro-optic layer 1204. The message set into the bottom surface of theelectro-optic material is now fixed, permanent, and irreversible,thereby providing valuable visual information to a viewer or reader ofthe intelligent label.

At a later time, the intelligent label may be made aware that the bottommessage is no longer valid or needs to be updated or corrected. Thisdetermination can be made remotely and communicated to the intelligentlabel control circuits 1206, or the intelligent label control circuits1206 may make that determination responsive to a timer or environmentalsensor. Accordingly, it is important that a new, second or top messageis generated that either obscures the current, bottom message or incombination with the current message, creates a third, corrected orupdated message.

To set a top message 1404, the process described above is basicallyreversed. Once the label control circuitry 1206 determines to fix amessage into the electro-optic layer 1204, it uses local power to applya second conditioning voltage to the top electrode 1208, which isadjacent to the top message surface of the electro-optic layer 1204.This voltage may be a relatively high, for example 3 volts, and appliedfor a relatively long period of time, for example 3-4 seconds. It willbe appreciated that other voltages and times may be used, and that thesecond conditioning voltage may be applied in bursts, ramps, pulses, orother such waveforms or variations. After the second conditioningvoltage is completed, the control circuitry 1206 reverses the polarity,and applies a second setting voltage to the bottom electrode 1202, whichsets and permanently fixes the second (top) message into the top messagesurface of the electro-optic layer 1204. This setting voltage istypically at a lower voltage, such as 1.2 volts, and is applied for ashorter period of time, such as 1-2 seconds. It will be appreciated thatother voltages and times may be used, and that the setting voltage maybe applied in bursts, ramps, pulses, or other such waveforms orvariations. The change or obliteration pattern set in the top messagesurface of the electro-optic layer is now fixed, permanent, andirreversible, thereby alters the combined message that can be viewed orread. If the second activation used an obscuring pattern, then thesecond activation prevents, hinders or discourages a viewer or readerfrom using the underlying first (bottom) message. If the secondactivation was a supplementing or altering pattern, than a new message,which is the combination of the upper and lower patterns, is nowviewable and readable.

In an extension to this activation process, the application of adifferent voltage on the first surface as compared to the second surfacecan result in each surface being fixed at a different color. In aspecific example, the bottom conditioning and setting voltages remain asdescribed above with reference to FIG. 12, but the top conditioningsignal is applied at a higher voltage, such as 7 volts. In this way, afirst color is set on the bottom surface, and a second color is set onthe top surface. In this way, a resulting message can be the perceivedcombination of the bottom and top colors.

In a slight modification to the process and device described above, tocolors may be set into a single surface using the general activationvoltage described above. For example, a lower activation voltage may beapplied to a portion of a surface at a first time, setting a pattern orsymbol to a first color, and at a second time, a higher activationvoltage can be applied to a different portion of the surface, setting apattern or a symbol in that area to a second color. In yet anothermodification, a pattern or patterns can be provided by a set of segmentson a single surface, with each of the segments comprising aninterdigitated electrode pair. In this way, each segment can be color toa first color with application of a lower activation voltage, or to asecond color with the application of a higher activation voltage. Inthis way, all the segments could be set to a first color, all to asecond color, or some to the first color and some to the second color.

In certain constructions, and depending in part on the composition ofthe electro-optic layer, desired speed of transition, available power,and the desired persistence of the message, alternative activationmethods may be advantageously used. Using the single pair, dual layerelectrode construction such as that described above, a first, bottommessage and a second, top message may be fixed, using a first signal,first voltage and a second signal, second voltage. The first signal,comprising a first voltage may be applied to the bottom electrodegenerating a first, bottom message. Once the first voltage is completedthe message may exhibit less persistence than when followed immediatelyby a setting signal, setting voltage or it may naturally transition tolonger persistence or permanence. Subsequent to the first signal, firstvoltage being completed the polarity may be reversed and a secondsignal, second voltage applied to the second, top, message surface ofthe electro-optic layer. This second signal, second voltage wouldgenerate a second, top message. And importantly, it would also functionas a first setting signal, first setting voltage, and fix the firstmessage permanently and irreversibly. It is to be understood thatdifferent electrode constructions and activation signals can be used toadvantageously depending on the desired function and performance of theintelligent label.

Two Sided Display

As illustrated in FIG. 15 an electro-optic display 1500 may beconstructed with an opaque electro-optic layer 1504, a first, bottomtransparent electrode layer 1502, a second, top transparent electrodelayer 1508, a transparent bottom substrate 1510 and a transparent topsubstrate 1506. Once activated, a first message on the first, bottom,message surface of the electro-optic layer 1504 can on be seen from oneviewing position, and a second message on the second, top messagesurface of the electro-optic layer 1504 can be seen from an oppositeviewing position. In this way, a two-sided label, tag windshield stickeror window display etc. can be constructed, with each messageindependently controlled. It will be appreciated that this constructioncan use different combinations of electrode configurations such asinterdigitated or single electrodes as set forth above. A similarconstruction using a transparent electro-optic layer can also be used tocreate compound messages that can be viewed from both viewingperspectives.

Two or More Electro-Optic Layers

Electro-optic displays can also be constructed with more than onelectro-optic layer and corresponding electrode layers as appropriate.FIG. 16 illustrates an electro-optic display 1600 comprising twoelectro-optic layers (1603 & 1605) and three electrode layers (1604,1606, &1608). Combined, the electro-optic device would have a total offour message surfaces: one on each side (top and bottom) of eachelectro-optic layer.

An example of the single signal activation method describe abovefollows. A first voltage signal is applied to the first (bottom)electrode layer 1604 using the middle electrode layer 1606 as a ground.This arrangement would activate the first (bottom) message surface ofthe first electro-optic layer 1605 and create a first message. A secondsignal, applied to the middle electrode 1606 using the first (bottom)electrode layer 1604 as a ground, would set a second message on the topmessage surface of the first electro-optic layer 1605. A third signal,applied to the second (middle) electrode 1606 using the third (top)electrode layer 1608 as a ground, would set a third message on thebottom message surface of the second electro-optic layer 1611. A fourthsignal applied to the third (top) electrode 1608 using the middleelectrode 1606 as a ground, would set a fourth message on the topmessage surface of the second electro-optic layer 1611. Theelectro-optic layers (1603 & 1603), electrode layers (1604, 1606, &1608)and substrates (1602 and 1614) are advantageously transparent or neartransparent, or opaque depending on the desired functions, viewingdirection, and particular application for the electro-optic display orintelligent label.

FIG. 17 illustrates an alternative four surface electro-optic display1700 constructed using a middle, transparent substrate 1706 with anadditional electrode layer. As in the previous example the electro-opticlayers (1704, 1706 & 1708), electrode layers (1703, 1705, 1707 & 1709)and substrates (1712 and 1714) are advantageously transparent or neartransparent, or opaque

While particular preferred and alternative embodiments of the presentintention have been disclosed, it will be appreciated that many variousmodifications and extensions of the above described technology may beimplemented using the teaching of this invention. All such modificationsand extensions are intended to be included within the true spirit andscope of the appended claims

What is claimed, is:
 1. An electro-optic display, comprising: anelectro-optic layer having a first message surface and a second messagesurface, the message surfaces being on opposing sides of theelectro-optic layer; and a first electrode adjacent to the first messagesurface and a second electrode adjacent to the second message surfaceand arranged to fix a first message into the first surface at a firsttime and a second message into the second surface at a second time. 2.The electro-optic display of claim 1, wherein at least one of theelectrodes is transparent.
 3. The electro-optic display of claim 1,wherein the first message surface has another electrode that cooperateswith the first electrode to form a first electrode pair.
 4. Theelectro-optic display of claim 3, wherein both electrodes in the firstelectrode pair are set to the same polarity at the time when the secondmessage is fixed.
 5. The first electrode pair of claim 3 wherein thefirst electrode pair is constructed in an interdigitated pattern.
 6. Theelectro-optic display of claim 3, wherein the second message surface hasanother electrode that cooperates with the second electrode to form asecond electrode pair.
 7. The second electrode pair of claim 6 whereinthe second electrode pair is constructed in an interdigitated pattern.8. The electro-optic display of claim 3, wherein the first electrodepair is constructed in an interdigitated pattern and the secondelectrode is constructed as a non-interdigitated electrode.
 9. Theelectro-optic display of claim 8, wherein both electrodes in the firstelectrode pair are set to the same polarity at the time when the secondmessage is fixed.
 10. The electro-optic display of claim 1, wherein oneor more of the electrodes are constructed to separately fix individualsegments or pixels.
 11. The electro-optic display of claim 1, whereinthe electro-optic layer is transparent or at least partiallytransparent.
 12. The electro-optic display of claim 1, wherein theelectro-optic layer is opaque.
 13. The electro-optic display of claim 1,further comprising a transparent substrate on the side of theelectro-optic display having the second message surface.
 14. Theelectro-optic display of claim 1, further comprising a substrate on theside of the electro-optic display having the first message surface. 15.The electro-optic display of claim 1, wherein the first message is fixedinto the first surface of the electro-optic layer permanently andirreversibly or the second message is fixed into the second surface ofthe electro-optic layer permanently and irreversibly.
 16. Theelectro-optic display of claim 1, wherein the first message is fixedinto the first surface of the electro-optic layer permanently andirreversibly and the second message is fixed into the second surface ofthe electro-optic layer permanently and irreversibly.
 17. Theelectro-optic display of claim 1, wherein the first message and thesecond message visually combine to form a new message.
 18. Theelectro-optic display of claim 1, wherein first message is a firstcolor, and the second message is a second color such that when viewed orread, the first message color and the second message color visuallycombine to form a new message.
 19. The electro-optic display of claim 1,wherein the second message impairs the perceptibility of the firstmessage.
 20. The electro-optic display of claim 1, wherein the secondmessage prevents the first message from being perceived.
 21. Theelectro-optic display of claim 1, wherein the second message alters theperception of the first message so to make it nonsensical.
 22. Anintelligent label, comprising: a power source; a processor; and anelectro-optic display, further comprising: an electro-optic layer havinga first message surface and a second message surface, the messagesurfaces being on opposing sides of the electro-optic layer; and a firstelectrode adjacent to the first message surface and a second electrodeadjacent to the second message surface and arranged to fix a firstmessage into the first surface at a first time and a second message intothe second surface at a second time.
 23. The intelligent label of claim22, constructed such that the first message is perceived only by lookingthrough the second message surface.
 24. The intelligent label of claim23, wherein the second message surface is transparent at a time afterthe first message has been set.
 25. The intelligent label of claim 23,wherein setting the second message prevents or impairs the ability toperceive the first message.
 26. The intelligent label of claim 23,wherein setting the second message alters the perception of the firstmessage.
 27. The intelligent label of claim 23, wherein, the firstmessage can be perceived from one side of the intelligent label and thesecond message can be perceived from the other side of the intelligentlabel.
 29. A method for first fixing a first message on a first messagesurface of an electro-optic layer and later fixing a second message on asecond message surface of the electro-optic layer comprising: providinga first electrode adjacent the first message surface and a secondelectrode adjacent the second message surface, the first message surfaceand the second message surface being on opposite sides of theelectro-optic layer; applying a first signal across the electrodes thatfixes the first message into the first message surface of theelectro-optic layer; and applying a second signal across the electrodesthat fixes the second message into the second message surface of theelectro-optic layer, the second signal applied at the opposite polarityas the first signal.
 30. The method according to claim 29 wherein thefirst message is a first color and the second message is a second colordifferent from the first color.
 31. The method according to claim 30wherein the first signal and the second signal are applied at differentvoltages.
 32. A method for first fixing a first message on a firstmessage surface of an electro-optic layer and later fixing a secondmessage on a second message surface of the electro-optic layercomprising: providing a first electrode adjacent the first messagesurface and a second electrode adjacent the second message surface, thefirst message surface and the second message surface being on oppositesides of the electro-optic layer; applying a first conditioning signalacross the electrodes; applying a first setting signal across theelectrodes that fixes the first message into the first message surfaceof the electro-optic layer, the first setting signal being at theopposite polarity as the first conditioning signal; applying a secondconditioning signal across the electrodes, the second conditioningsignal at the opposite polarity as the first conditioning signal; andapplying a second setting signal across the electrodes that fixes thesecond message into the second message surface of the electro-opticlayer, the second setting signal being at the opposite polarity as thesecond conditioning signal.
 33. The method according to claim 32,wherein the conditioning signals are at a higher voltage than theirrespective setting signals.
 34. The method according to claim 32,wherein the conditioning signals are applied for a longer time periodthan their respective setting signals.
 35. The method according to claim32 wherein the first message is a first color and the second message isa second color different from the first color.
 36. The method accordingto claim 35 wherein the first conditioning signal and the secondconditioning signal are applied at different voltages.
 37. A method forfirst fixing a first message on a first message surface of anelectro-optic layer and later fixing a second message on a secondmessage surface of the electro-optic layer comprising: providing a firstelectrode adjacent the first message surface and a second electrodeadjacent the second message surface, the first message surface and thesecond message surface being on opposite sides of the electro-opticlayer; applying a first setting signal across the electrodes that fixesthe first message into the first message surface of the electro-opticlayer; applying a conditioning signal across the electrodes, theconditioning signal at the opposite polarity as the first signal; andapplying a second setting signal across the electrodes that fixes thesecond message into the second message surface of the electro-opticlayer, the second setting signal being at the opposite polarity as theconditioning signal.
 38. The method according to claim 37, wherein theconditioning signal is at a higher voltage than the second settingsignal.
 39. The method according to claim 37, wherein the conditioningsignal is applied for a longer time period than the second settingsignal.
 40. The method according to claim 37 wherein the first messageis a first color and the second message is a second color different fromthe first color.
 41. The method according to claim 40 wherein the firstsetting signal and the conditioning signal are applied at differentvoltages.
 42. A method for first fixing a first message on a firstmessage surface of an electro-optic layer and then fixing a secondmessage on a second message surface of the same electro-optic layercomprising: providing a first electrode adjacent the first messagesurface and a second electrode adjacent the second message surface, thefirst message surface and the second message surface being on oppositesides of the electro-optic layer; applying a first conditioning signalacross the electrodes; applying a first setting signal across theelectrodes that fixes the first message into the first message surfaceof the electro-optic layer, the first setting signal being at theopposite polarity as the first conditioning signal; and applying asecond setting signal across the electrodes that fixes the secondmessage into the second message surface of the electro-optic layer. 43.The method according to claim 42, wherein the first conditioning signalis at a higher voltage than the first setting signal.
 44. The methodaccording to claim 42, wherein the first conditioning signal is appliedfor a longer time period than the first setting signal.
 45. The methodaccording to claim 42 wherein the first message is a first color and thesecond message is a second color different from the first color.
 46. Themethod according to claim 45 wherein the first conditioning signal andthe second setting signal are applied at different voltages.
 47. Amethod for fixing a message on a surface of an electro-optic layercomprising: providing a first electrode adjacent the message surface anda second electrode on the opposite surface of the electro-optic layer;applying a conditioning signal across the electrodes; and applying asetting signal across the electrodes that fixes the message into themessage surface of the electro-optic layer, the setting signal being atthe opposite polarity as the conditioning signal.
 48. The methodaccording to claim 43, wherein the conditioning signal is at a highervoltage than the setting signal.
 49. The method according to claim 43,wherein the conditioning signal is about 3 volts and the setting signalis about 1.2 volts.
 50. The method according to claim 43, wherein theconditioning signal is applied for a longer time period than the settingsignal.
 51. The method according to claim 43, wherein the conditioningsignal is not a continuous signals.
 52. The method according to claim43, wherein the setting signal is not a continuous signals.
 53. Themethod according to claim 43, wherein applying the conditioning signalat a first voltage generates a first color, and applying theconditioning signal at a second higher voltage generates a second colordifferent from the first.
 54. A method for first fixing a first messageon a first message surface of an electro-optic layer and later fixing asecond message on a second message surface of the electro-optic layercomprising: providing a first electrode pair adjacent the first messagesurface and a second electrode pair adjacent the second message surface,the first message surface and the second message surface being onopposite sides of the electro-optic layer; applying a first settingvoltage across the first electrode pair that fixes a first color intothe first message surface of the electro-optic layer; and applying asecond setting signal across second electrode pair that fixes a secondcolor into the second message surface of the electro-optic layer. 55.The method according to claim 54, further including the step of applyinga first conditioning signal across the first electrode pair prior toapplying the first setting voltage.
 56. The method according to claim54, further including the step of applying a second conditioning signalacross the second electrode pair prior to applying the second settingvoltage.
 57. The method according to claim 54 wherein the first settingvoltage and the second setting signal are applied at different voltages.